Add I18n support for "The topic has been deleted" message

app/assets/javascripts/discourse/controllers/topic_controller.js

@@ -211,7 +211,7 @@ Discourse.TopicController = Discourse.ObjectController.extend({
     var _this = this;
     this.unsubscribe();
     this.get('content')["delete"](function() {
-      _this.set('message', "The topic has been deleted");
+      _this.set('message', Em.String.i18n('topic.deleted'));
       _this.set('loaded', false);
     });
   },

config/locales/client.en.yml

@@ -416,6 +416,7 @@ en:
       read_position_reset: "Your read position has been reset."
       jump_reply_up: jump to earlier reply
       jump_reply_down: jump to later reply
+      deleted: "The topic has been deleted"
 
       progress:
         title: topic progress

config/locales/client.zh_CN.yml

@@ -422,6 +422,7 @@ zh_CN:
       read_position_reset: "你的阅读位置已经被重置。"
       jump_reply_up: 跳转至更早的回复
       jump_reply_down: 跳转至更晚的回复
+      deleted: "此主题已被删除"
 
       progress:
         title: 主题进度

config/locales/client.zh_TW.yml

@@ -422,6 +422,7 @@ zh_TW:
       read_position_reset: "你的閱讀位置已經被重置。"
       jump_reply_up: 跳轉至更早的回複
       jump_reply_down: 跳轉至更晚的回複
+      deleted: "此主題已被刪除"
 
       progress:
         title: 主題進度